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TROY, Mo (KMOV.com) -- Police say a man and woman have been charged after an infant they were babysitting died of a drug overdose.

The child's uncle, David Brewer, 27, and his girlfriend, Heather Maune, 38, are charged with second-degree involuntary manslaughter. Their bond has been set at $50,000 each.

According court documents, the infant was found dead on the afternoon of August 4th. Maune told police she woke up around 12:30 that afternoon and called 911 after she found the infant unresponsive. An initial autopsy did not pinpoint the cause of death.

September 18th, police received the results of toxicology tests that showed the infant died of oxycodone intoxication by swallowing one or several OxyContin pills. Police say neither Brewer or Maune had a prescription for the painkiller.

It's not clear if the infant managed to ingest the narcotics on her own, or if someone fed the medication to her.

"Whether the baby found a capsule on the floor or whether someone gave that to the baby, it's undetermined. Somehow, that substance got into the baby's system," said Major Raymond Floyd.

According to court records, a toxicology analysis could not pinpoint whether the victim ingested more than one pill. The dosage could have varied between one OxyContin pill to as many as eight, five milligram pills.

Floyd said the investigation is ongoing and police are still interviewing more potential witnesses. A narcotics investigation was launched to find the source of the prescription pain meds.